linux-kernel - [PATCH] mfd: cros_ec: Fix possible leak in led_rgb

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Date:	Sun, 19 Jul 2015 21:43:02 +0200
From:	Christian Engelmayer <cengelma@....at>
To:	olof@...om.net
Cc:	lee.jones@...aro.org, gwendal@...omium.org, wfrichar@...omium.org,
	smbarber@...omium.org, linux-kernel@...r.kernel.org,
	Christian Engelmayer <cengelma@....at>
Subject: [PATCH] mfd: cros_ec: Fix possible leak in led_rgb_store()

Function led_rgb_store() contains some direct returns in error cases that
leak the already allocated cros_ec_command message structure. Make sure
that 'msg' is freed in all exit paths. Detected by Coverity CID 1309666.

Signed-off-by: Christian Engelmayer <cengelma@....at>
---
Compile tested only. Applies against linux-next.
---
 drivers/platform/chrome/cros_ec_lightbar.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index 144e09df9b84..4e598c11e8a4 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -252,7 +252,7 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
 
 		ret = sscanf(buf, "%i", &val[i++]);
 		if (ret == 0)
-			return -EINVAL;
+			goto exit;
 
 		if (i == 4) {
 			param = (struct ec_params_lightbar *)msg->data;
@@ -268,17 +268,15 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
 			if ((j++ % 4) == 0) {
 				ret = lb_throttle();
 				if (ret)
-					return ret;
+					goto exit;
 			}
 
 			ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
 			if (ret < 0)
 				goto exit;
 
-			if (msg->result != EC_RES_SUCCESS) {
-				ret = -EINVAL;
+			if (msg->result != EC_RES_SUCCESS)
 				goto exit;
-			}
 
 			i = 0;
 			ok = 1;
-- 
1.9.1

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